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Engine runs rough after plug and wire change

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Engine runs rough after plug and wire change

This topic contains 2 replies, has 3 voices, and was last updated by Brian Regner Brian Regner 3 weeks, 3 days ago.

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    Topic
  • #987016
    Charles Craven
    Charles Craven
    Participant

    I had my plugs and wires changed by a GM dealer on my 2012 Avalanche. I noticed that it runs rough compared to before. I took it back and they hooked it up to computer and showed me it was not missing. I trust the dealer as my sister works there, but curious as to what else it could be if it looks ok on computer? I notice it much more when i first crank engine. Ideas?

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  • #987028
    Nightflyr *
    Richard Kirshy
    Participant

    Lets look at the issue..
    I assume the engine ran fine before the service?
    If so the issue can be narrowed down to what was replaced.
    Were the correct plugs installed?
    Were the correct plugs gaped properly?
    Were the correct wires installed?
    All things being equal and nothing other than plugs and wires were changed, that is most likely the cause of your trouble.

    #987039
    Brian Regner
    Brian Regner
    Participant

    One of the wires may not be seated fully or a plug could be gapped incorrectly

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